Which of the following regarding oxalate compound is/are true?

Options

A. Oxalic acid `(H_(2)C_(2)O_(4))` can be estimated by titratin against either `KOH` or `KMnO_(4)` solution.
B. `KHC_(2)O_(4)` can be extimated by titrating against either `KOH` or `K_(2)CrO_(4)` and in both analyses equivalent weight of `KHC_(2)O_(4)` is 64. `(MW "of" KHC_(2)O_(4) = 128)`
C. `K_(2)C_(2)O_(4)` can be estimated by titrating against either `HCl` or `KClO_(3)` and in both analyses equivalent weight of `K_(2)C_(2)O_(4)` is 83. `(MW "of" K_(2)C_(2)O_(4) = 166)`
D. If `10mL` of a `K_(2)C_(2)O_(4)` solution required `8.0 mL` of a `0.12 M HCl` solution, `10 mL` of the same `K_(2)C_(2)O_(4)` solution would require `9.60 mL` of a `0.02 M` acidified `KMnO_(4)` solution.

Answer

To determine which statements regarding oxalate compounds are true, we will analyze the provided information step by step.

### Step 1: Understanding Oxalic Acid and Its Estimation
Oxalic acid (H2C2O4) can be estimated through titration with either KOH (a strong base) or KMnO4 (an oxidizing agent).

- **True Statement**: Oxalic acid can be titrated with KOH or KMnO4.

### Step 2: Oxidation State of Carbon in Oxalic Acid
In oxalic acid (H2C2O4), the oxidation state of carbon is +3. When it reacts with KMnO4, it gets oxidized to CO2, where the oxidation state of carbon is +4.

- **True Statement**: The oxidation number of carbon in H2C2O4 is +3.

### Step 3: Estimation of Potassium Hydrogen Oxalate (KHC2O4)
Potassium hydrogen oxalate (KHC2O4) can also be estimated by titration against KOH or K2Cr2O7. The equivalent weight of KHC2O4 is calculated to be 64, while its molecular weight is 128.

- **True Statement**: KHC2O4 can be estimated by titrating against KOH or K2Cr2O7, but the equivalent weight is 128, not 64.

### Step 4: Estimation of Potassium Oxalate (K2C2O4)
Potassium oxalate (K2C2O4) can be estimated by titrating against HCl or KClO3. The equivalent weight of K2C2O4 is calculated to be 83, with a molecular weight of 166.

- **True Statement**: K2C2O4 can be estimated by titrating against HCl or KClO3, and the equivalent weight is indeed 83.

### Step 5: Analyzing the Titration Data
The titration data provided states that 10 mL of K2C2O4 requires 8 mL of 0.12 M HCl and 9.6 mL of 0.02 M KMnO4.

- **True Statement**: The calculations confirm that the equivalents of K2C2O4 are equal to the equivalents of HCl and KMnO4, validating the titration results.

### Conclusion
Based on the analysis, the true statements regarding oxalate compounds are:
- Oxalic acid can be estimated by titration with KOH or KMnO4.
- The oxidation number of carbon in H2C2O4 is +3.
- KHC2O4 can be estimated by titrating against KOH or K2Cr2O7, but the equivalent weight is 128.
- K2C2O4 can be estimated by titrating against HCl or KClO3, and the equivalent weight is 83.
- The titration results are consistent with the expected equivalents.